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@lumi
Is this a joke?

A singleton is one of the most terrible anti-patterns ever invented. Global variables are frowned upon, or forbidden; but singletons (fancy global variables that need a lot of red tape): fine! Because, it's a pattern.

I once had to remove 24 singletons from a 250kLOC C++ code base. Not fun.

I'd say: Singletons, there must be none.